Direct3D viewport problems

[Robert Fairlie]

Hello,

I'm having problems with DirectX viewports under Wine. I'm rendering to an offscreen surface and then copying the contents of the offscreen surface to a window. I first set the viewport to coincide with the window, i.e.

vp.X = 0;
                                            vp.Y = 0;
                                            vp.Width = windowRect.Width();
                                            vp.Height = windowRect.Height();

I render most of the the scene using the above viewport.

I then need to draw an arrow in the bottom left hand corner of the of the window inside a square of side iSize, so I set:

vp.X = 0;
                                            vp.Y = windowRect.Height() - iSize;
                                            vp.Width = iSize;
                                            vp.Height = iSize;

Since iSize is only about a fifth of the window height, I would expect the arrow to be displayed at the bottom left of the window. but it's actually being displayed at the top left. The main part of the scene rendered with the first viewport settings is fine.

The code does as expected in Windows, so I was wondering if anyone knows of any problems in this area. I'm also having problems with CD3DFont which I think might be related to this.

Thanks for any advice,

Robert Fairlie

[H. Verbeet]

On 01/05/07, Robert Fairlie  wrote:
> Since iSize is only about a fifth of the window height, I would expect the
> arrow to be displayed at the bottom left of the window. but it's actually
> being displayed at the top left. The main part of the scene rendered with
> the first viewport settings is fine.
>
> The code does as expected in Windows, so I was wondering if anyone knows of
> any problems in this area. I'm also having problems with CD3DFont which I
> think might be related to this.

Direct3D coordinates are flipped compared to GL coordinates, so it
certainly sounds like a something that could go wrong. You didn't
explicitly mention if you are rendering offscreen with the second
viewport as well, but I'm assuming you are.

Could you write a minimal test case to reproduce the problem? My
initial guess would be that
http://source.winehq.org/git/wine.git/?a=blob;f=dlls/wined3d/state.c;h=1a0bc...
is the relevant code, but depending on the offscreen redering mode
selected (in wine) there are potentially other places where things
could go wrong as well.

[Stefan Dösinger]

Am Dienstag 01 Mai 2007 13:17 schrieb H. Verbeet:
> On 01/05/07, Robert Fairlie  wrote:
> > Since iSize is only about a fifth of the window height, I would expect
> > the arrow to be displayed at the bottom left of the window. but it's
> > actually being displayed at the top left. The main part of the scene
> > rendered with the first viewport settings is fine.
> >
> > The code does as expected in Windows, so I was wondering if anyone knows
> > of any problems in this area. I'm also having problems with CD3DFont
> > which I think might be related to this.
>
> Direct3D coordinates are flipped compared to GL coordinates, so it
> certainly sounds like a something that could go wrong. You didn't
> explicitly mention if you are rendering offscreen with the second
> viewport as well, but I'm assuming you are.

I corrected a number of problems with the viewport setup some time ago for 
shadow rendering in Half-Life 2 and Final Fantasy XI, but the shadows in hl2 
aren't perfect yet, so I suspect some remaining problems. To narrow the issue 
down I need some more information: Are you using a vertex shader or not? Are 
you using pretransformed geometry? (D3DFVF_XYZRHW, or the equivalent vertex 
declaration flag). Are you using vertex blend weights? Those parameters 
affect the way the opengl transforms and the viewport is set up.

A test case would be useful, we could commit it to our wine test suit to avoid 
regressions once the problem is fixed. Otherwise I want to get detailed 
shadows in half-life 2 working properly soon, if you're lucky that fixes your 
bug too.